FIG. 16. Schematic northeast-southwest profile of the Pacific slope in the porphyry copper belt of southern Perú, showing the relative positions of the documented landform surfaces: the Altos de Camilaca (I) and Pampa Lagunas (II) pediplains and equivalents, the Cerro de las Chulpas (III), Pampa Sitana (IV), and Cerro Sagollo (V) pediments and equivalents. The landform chronology is constrained by ⁴⁰Ar-³⁹Ar dates for Tertiary ignimbrite ash flows, and the age of supergene mineralization is summarized by ⁴⁰Ar-³⁹Ar dates for alunite group minerals for mines (solid black square) or deposits and prospects (light gray square).